An “up” quark has a charge of -2/3 times the electron’s charge. A “strange” quark has a charge of +1/3 times the electron’s charge. What is the net charge of the quark triplet consisting of two up quarks and a strange quark? (This quark triplet is one of a family of three “? particles.”)
A. +(5/3)e
B. +e
C. +(1/3)e
D. zero
E. -(1/3)e
F. -e
T. -(5/3)e
B. +e
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Charge: If a charge generator builds a negative static charge of -7.00 ?C, how many electrons are transferred to it during this process. (e = 1.60 × 10-19 C)
A. 4.38 × 1013 B. 7.0 C. 1.12 × 10-18 D. 43.8
For large mass number nuclei which are stable, the ratio of protons to neutrons is
a. equal to 1 b. greater than 1 c. less than 1 d. unrelated to the stability of nuclei e. almost 2 to 1
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?
Distinguish between a high- and a low-pressure cell